* Update brand images (#95)

* add section on Tigris Data to storage platforms
* add instructions on b3sum for builds

Author: bdon

basemaps/downloads.md

@@ -20,6 +20,8 @@ Please note that **URLs may change** and hotlinking to these downloads are disco
 
 The Version 4 Protomaps basemap daily build channel is available at [maps.protomaps.com/builds](https://maps.protomaps.com/builds). This is compatible with `protomaps-themes-base` style v4.0.0 and newer.
 
+[BLAKE3](https://github.com/BLAKE3-team/BLAKE3/releases/) hashes are provided for daily builds. Use `b3sum` to verify the integrity of your downloaded file.
+
 A mirror in the AWS `us-west-2` is available on [Source Cooperative (beta)](https://beta.source.coop) at the [protomaps/openstreetmap](https://beta.source.coop/repositories/protomaps/openstreetmap/) repository. This mirrors the most recent daily build only.
 
 ### Build History

pmtiles/cloud-storage.md

@@ -228,6 +228,19 @@ Deno.serve(async (req) => {
 });
 ```
 
+
+### Tigris Data
+
+* [Tigris Data](http://tigrisdata.com) is S3-compatible and offers buckets distributed to multiple locations around the world for low latency.
+* Tigris data has [no egress fees](https://www.tigrisdata.com/docs/pricing/).
+
+#### CORS
+
+In the **Bucket > Settings** of your Tigris bucket, scroll to **CORS Configuration**.
+
+- For **Allowed Methods** and **Allowed Headers**, choose or input `*`. This is required for preflight requests.
+- For **Expose Headers**, input `ETag`.
+
 ## Other Platforms
 
 ### GitHub Pages